Re: JPEG decoding question


Dennis wrote:
> Thanks for your reply.
> BTW, are the DC coeffiecients always calculated by the order of
> encoding or by a line of 8x8 block, left to right and then to the next
> line left to right?

The DC component is calculated like the other 63 AC components (same
block order) except that instead of storing the value, the file stores
the difference from the previous DC component of the same color
(previous in the order that the blocks are stored). See the JPEG spec.

-- Matt Mahoney

.

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